Physics 122 5/2/11 Prof. E. F. Redish 1 5/2/11 1 Physics 122 5/2/11 2 Physics 122 4/29/11 4 Physics 122 0 – – – – – – – + + + + + + + V EPhysics 122 5/2/11 Prof. E. F. Redish 2 5/2/11 7 Physics 122 – – – – – – – + + + + + + + ΔV E L 5/2/11 8 Physics 122 ΔV = EΔx = ELE = 4πkCσ= 4πkCQA⇒ Q =A4πkC⎛⎝⎜⎞⎠⎟EQ =A4πkCL⎛⎝⎜⎞⎠⎟ΔVVCQ Δ=What does this “Q” stand for? 4kc is often written as “1/0” 5/2/11 9 Physics 122 1 Farad = 1 Coulomb/VoltPhysics 122 5/2/11 Prof. E. F. Redish 3 5/2/11 10 Physics 122 VCQ Δ=5/2/11 16 Physics 122 Energy stored in a capacitor =12QΔV =12C ΔV()2=Q22C5/2/11 17 Physics 122Physics 122 5/2/11 Prof. E. F. Redish 4 5/2/11 18 Physics 122 V – – – – – – – + + + + + + + 0 E – – – – – – – + + + + + + + 5/2/11 19 Physics 122 C =14πkCAd'5/2/11 20 Physics 122 – – – – – – – + + + + + + + 0 E – – – – + + + + there werematerial no ifmaterial inside1EEκ=Physics 122 5/2/11 Prof. E. F. Redish 5 5/2/11 21 Physics 122 – – – – – – – + + + + + + + 0 – – – – + + + + E =1κσε0E =Qκε0AΔV = EL =Lκε0A⎛⎝⎜⎞⎠⎟QC =κε0AL5/2/11 22 Physics 122 C
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